Sodium Silicate

Sodium silicate

Application field of sodium silicate, by taking advantage of its unique properties, has achieved epoch-making development such as silica gel, precipitated silica, colloidal silica, civil engineering, papermaking, adhesives, casting, etc.

Product Usage

  • Civil engineering
    Materials for soil improvement, shield tunnel constructions
  • Construction
    Materials for concrete surface treatment, refractories, geopolymers
  • Anhydrous silicate
    Raw materials for silica gel, precipitated silica, colloidal silica, etc.
  • Soap and detergent
    Builder and additives
  • Casting
    Inorganic binder for casting sand
  • Paper and pulp
    Suppression of self-degradation of bleach and promotion of free paper fiber
  • Synthetic zeolite
    Raw materials for various zeolites such as adsorbed separators, ion exchange materials, catalysts, etc.
  • Welding
    Welding flux binding agent
  • Ceramic
    Binders, dispersant and peptizer for cray
  • Adhesive
    Adhesives for inorganic fibers, building materials and molds, also for coating agents and sealing materials
  • Textile
    Suppression of self-degradation of bleach and for fire-proofing processing
  • Water treatment
    Flossant adulants for the removal of trace impurities
  • Other uses
    Raw materials for various silicate, sodium meta and orthosilicate for degreasing agent, coating agent for titanium oxide, and sodium silicate powder for ceramics and detergent

Fuji Chemical specifications of sodium silicate

No.1 No.2 No.3 No.4 No.5
Na2O% 15.0 - 16.0 11.3 - 12.3 9.0 - 10.0 7.2 - 8.2 6.5 - 7.5
SiO2% 31.0 - 33.0 27.5 - 29.5 28.0 - 30.0 24.0 - 26.0 25.0 - 27.0
Specific Gravity (20℃) 1.56 - 1.59 1.435 - 1.465 1.39 - 1.42 1.31 - 1.34 1.31 - 1.33
Fe% < 0.02 < 0.02 < 0.02 < 0.02 < 0.02
 Insolubility < 0.2 < 0.2 < 0.2 < 0.2 < 0.2
Calculation formula for molar ratio

In most cases, the sodium silicate product with appropriate molar ratio is selected depending on the application.
In production, from sodium silicate No.3, which is most common grade, No.1 and No.2 are processed by adding caustic soda. No.4 and No.5, on the other, are manufactured by adding silica to No.3.